Search for a light exotic particle in J/psi radiative decays

Abstract

Using a data sample containing 1.06x10^8 psi' events collected with the BESIII detector at the BEPCII electron-positron collider, we search for a light exotic particle X in the process psi' -> pi^+ pi^- J/psi, J/psi -> gamma X, X -> mu^+ mu^-. This light particle X could be a Higgs-like boson A^0, a spin-1 U boson, or a pseudoscalar sgoldstino particle. In this analysis, we find no evidence for any mu^+mu^- mass peak between the mass threshold and 3.0 GeV/c^2. We set 90%-confidence-level upper limits on the product-branching fractions for J/psi -> gamma A^0, A^0 -> mu^+ mu^- which range from 4x10^{-7} to 2.1x10^{-5}, depending on the mass of A^0, for M(A^0)<3.0 GeV/c^2. Only one event is seen in the mass region below 255 MeV/c^2 and this has a mu^+mu^- mass of 213.3 MeV/c^2 and the product branching fraction upper limit 5x10^{-7}.

7 pages, 3 figures, submitted to Physical Review D

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Cited by in corpus (19)

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• Observation of $a_0^0(980)$-$f_0(980)$ Mixing
• Probing the $\mu \nu$SSM with light scalars, pseudoscalars and neutralinos from the decay of a SM-like Higgs boson at the LHC
• Partial wave analysis of $\psi (3686)\to K^{+}{K}^{-}\eta$
• The $U$ boson, interpolating between a generalized dark photon or dark $Z$, an axial boson and an axionlike particle
• Partial wave analysis of $J/\psi \to \gamma {\eta }^{\prime }{\eta }^{\prime }$
• Study of $J/\psi$ and $\psi (3686)$ decays to ${\pi }^{+}{\pi }^{-}{\eta }^{\prime }$
• Search for a light CP-odd Higgs boson in the radiative decays of J/psi
• Observation of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$
• Search for a $CP$-odd light Higgs boson in $J/\psi \to \gamma A^0$
• Measurement of ${\chi }_{cJ}$ decaying into ${\eta }^{\prime }{K}^{+}{K}^{-}$
• Search for the weak decay ${\eta }^{\prime }\to K^{\pm }{\pi }^{\mp }$ and precise measurement of the branching fraction $\mathcal{B}(J/\psi \to \varphi {\eta }^{\prime })$
• Search for the rare decays $J/\psi \to D^0{e}^{+}{e}^{-}+c.c.$ and $\psi (3686)\to D^0{e}^{+}{e}^{-}+c.c.$
• Observation of the decays ${\chi }_{cJ}\to {\Sigma }^0\bar{p}{K}^{+}+c.c.(J=0,1,2)$
• Search for the $X(2370)$ and observation of ${\eta }_c\to \eta \eta {\eta }^{\prime }$ in $J/\psi \to \gamma \eta \eta {\eta }^{\prime }$
• Observation of the very rare ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$ decay
• The Forward Physics Facility at the High-Luminosity LHC
• Testing the HyperCP anomaly at LHCb: evidence for the ${\Sigma }^{+}\to p{\mu }^{+}{\mu }^{-}$ decay